Thanks to Searz for the awesome guide format! You can find it here.

Hi, I am known as Satzmann666 (or Threshmeister to some ppl) and this is my very first guide, so i'll try to make it as complex and badass as possible. I have been maining support role since I joined ranked games and I soon realised how hard it is to carry games from that position.

Morgana became my mid lane ticket to gold/plat in seasons 4 and 5 basically the first game I played her, especially for her safe and rewarding gameplay. As a mid laner or support, she brings great utility to the team, as well as nice damage and her ultimate Soul Shackles is undoubtedly one of the best ultimates for teamfights. I hope you will enjoy playing her just as much as I do.

My guide should give you a reasonable idea on what kinds of runes, masteries, summoner spells, skill distributions, items and tactics you should be using. It has divided sections for both MID LANE and SUPPORT Morgana.

If you think that anything in my guide is untrue, you find a mistake, or just disagree with a certain item, point in masteries or rune, please let me know in comments rather than downvote the whole guide without a single word and leave.

This guide is now fully updated for season 6 changes.

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I do not really like giving advices on runes since everyone tailors those to fit their own playstyle, so feel free to change some and see if its working for you.

3x Greater Quintessence of Ability Power is sort of must have on most AP mids as well as 9x Greater Mark of Magic Penetration. Seals and Glyphs are really up to your imagination, just keep in mind that Morgana is AP champion and critical damage is not really useful on her :)
I use these same runes on SUPPORT Morgana.

FARMING
When laning as Morgana, your main goal should be your farm => lasthitting minions and farming with Tormented Shadow.
As soon as you get rank 3 Tormented Shadow, farm caster minions from each wave with it and AA the melee ones. I would say that if you get 5 minions per wave => 60 - 70 CS on 10 minutes, it is good farm, but you usually consider anything higher than your opponents CS a good farm.
If you know how to do so, freeze your lane and zone your opponent so he gets less minions (remember you can heal back some harras due to your innate spellvamp from Soul Siphon).
You can use your Dark Binding to secure lasthits on siege (cannon) minions, but keep in mind that it costs you mana and if you have it on CD, you are much more vulnerable for engage from the enemy laner/jungler.

GANKS
Morgana is sometimes called an "ungankable" mid laner and it is not far from the truth. You farm safely using Tormented Shadow and do not need to go too far away from your turret, and even if you do, you can still Black Shield yourself in a bad situation, fire Dark Binding in enemy junglers or mid laners face and run under your turret. While being dived, your best chance is to Black Shield yourself, throw everything you have on enemy who is being focused by turret and run.
If everything else fails, you should still have Flash to get away.
On the other hand, Morgana is great at setting up ganks with Dark Binding and Soul Shackles. If your jungler is comming for a gank, position yourself so you can hit Dark Binding followed with Tormented Shadow, or use your Soul Shackles => Dark Binding => Tormented Shadow (=> Ignite) combo to get a kill.
Same combo is what you use when engaging on your own.

ROAMING
Morgana might not seem like a spectacular champion for roaming due to low mobility, but if needed, you can still greatly help out your teammates on other lanes.
Make sure the lane you are about to roam to knows about your intentions and go in with either surprise Dark Binding from unwarded bush or ( Flash =>) Soul Shackles => Dark Binding => Tormented Shadow.
When facing any notorious roam champion Fizz, Ahri, Akali, always call ss/mia if you do not see them for longer than 5 seconds and if you know which way they went, alert that lane and try to safely follow them.

OBJECTIVES
It is not champion kills that win games, but objectives (turrets, inhibitors, dragon, herald/baron) so try to take control over those. From a certain point of game (6 minutes) have both Dragon pit and Baron pit warded. In early game, if you get a chance (enemy jungler dead or low and recalling, enemy bot lane dead, etc) rally your team for Dragon.
As Morgana when taking either of boss monsters, stand out of the pit using your Tormented Shadow and autoattacks to help and possibly have your Dark Binding ready for anyone who would try to come and steal it (or use it to help with boss if your team wants to rush it).

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FARMING
As a support DO NOT FARM (so obvious :D), but focus by all means on helping your ADCs farm.
So poke enemy ADC and support with Dark Binding and autoattacks for some nice dmg and extra money from Bandit , Black Shield any incomming CC and zone out enemy ADC from farm if you can.

GANKS
You should have wards in river and in tri-bush to see enemy jungler soon enough to retreat, but if something goes wrong and you get ganked, you have to do the same procedure as on mid lane: Black Shield your carry or yourself depending on who is in danger of being CCed (if the danger is the same for both, shield your carry ofc), fire Dark Binding into a enemy junglers/ADCs face and run under your turret.
When your junglers is about to gank, ping where you think (or know) enemy support placed wards, and fire a well aimed and timed Dark Binding or perform the already mentioned ( Flash =>) Soul Shackles => Dark Binding => Tormented Shadow (=> Ignite) combo.

OBJECTIVES
Your key role at securing Dragon and Baron is keeping vision on them, and possibly denying enemy vision.
Dragon should be warded after ASAP in game or so and has 6 minutes respawn time after killed.
Baron should be warded after 15:00 in game or so and has 7 minutes respawn time.
When taking either of them, use at first your trinket or Vision Ward to check for enemy vision, then use Tormented Shadow and autoattacks to help with boss and possibly have Dark Binding ready for anyone who would try to come and steal it.

Morgana in teamfights should behave the same regardles on her role in team.
You try to hit any enemy carry with Dark Binding followed with Tormented Shadow, Black Shield your engaging tank (unless he is Olaf again :D), or yourself or any other CC focused carry and hit as many enemies possible with Soul Shackles => Zhonya's Hourglass combo.
After your golden 2,5 seconds end, repeat Dark Binding => Tormented Shadow combo into a nearest stunned carry and try to reposition so enemy team cannot kill you after stun goes off.
Remember that Zhonya's Hourglass makes you unable to move so be careful with it. If you want to stun as many enemy champions as possible, try to follow them at first and if they focus you, use Zhonya's Hourglass to punish them for doing so.

I personally think it is not so bad for a first guide and hope it is going to be any helpful for those who seek knowledge on how to play Morgana.
I would like to thank Searz again for the guide template that helped me understand coding a lot and Riot for making such a great champion I could write a guide for.

Feel free to comment in any language you want, but I will only answer those in English and Czech because I am a racist f**kabish ;).